[Xorp-users] Linux IPv6 MR

[Pavlin Radoslavov]

> > Also, can you provide some additional info when the assertion is
> > triggered. E.g., does it happen when the first data packet is
> > forwarded, etc.
> 
> It actually starts when XORP's pim6d is launched, before
> any forwarding attempt, that assertion floods the logs,
> sometimes tenths of times per second and it nevers stops
> until XORP is taken down.

Interesting.
Do you know whether there were any multicast data packets on any of
the directly connected interfaces.
In my limited testing I didn't see such kernel assertion, but I was
using an older USAGI tarball (from October 2005), and I didn't have
IPv6 multicast traffic.

> > > I'm not a routing expert but would like to know what
> > > exactly the 'enable-ip-router-alert-option-check'
> > > option do?  I don't see a difference with true or
> > > false.  If enabled is much verbose the output.
> > 
> > If it is enabled, then certain PIM-SM control packets must have the
> > IP Router Alert option set to be accepted, otherwise those packets
> > will be dropped with a warning like:
> > "RX %s from %s to %s on vif %s: missing IP Router Alert option"
> > 
> > If all appropriate PIM control messages from your PIM-SM neighbors
> > contain the IP Router Alert message (as specified in the PIM-SM
> > spec), then you won't see any difference even if you enable the
> > enable-ip-router-alert-option-check option.
> 
> From your experience, in necessary to disable in any modern
> environment (with other linux, bsds, macosx, solaris, winxp)?

You could safely disable it (and I think its default value is false,
i.e., disabled).

Thanks,
Pavlin